Ordered Lists

What is this?

It presents users with a simple choice between two list items selected at random. How an item's score – and therefore position in the list – changes post-win/loss depends on the scores of both it and its opponent, not their positions or an arbitrary increment: a predictable result has little effect; an unpredictable one the opposite. Sound familiar? It's based on the Elo rating system, which received some publicity in the film The Social Network — although this idea came about long before I saw the movie!

You can't fix the results by repeat-clicking or cobbling together some custom HTML: I've built in some server-end fraud prevention.